As has been mentioned above, the 'distance & offset' switch library was the original UK library and was pretty much a direct conversion of the MX Rail switch library. A few years ago Network Rail published an official suite of true geometry libraries, available to download on their Standards Design Catalog, which I'm guessing is where you got your [Begin Turnout] example above. Because these libraries have been validated by Network Rail and published as RE/PW files (RE/PW/1205 & RE/PW/1215 for the text version, RE/PW/1206 & RE/PW/1216 for the XML version), these are the ones that should be used. I understand these have superseded the 'distance & offset' switch library.
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